Improvement in prism-lathes



UNITED STATES ALBERT ICELSEY, OF OHARLESTOWN, MASSACHUSETTS, ASSIGNOR TO HIM- PATENT OFFICE.

SELF AND AMOS BROWN, OF SAME PLAGE.

IMPROVEMENT IN PR|SM-LATHES.`

Specification forming part of Letters Patent No. 5 M388, dated December 5, 1865.

'To all whom it may concern.:

j holders.

The purpose ofthe said lathe is to enable a person to turn a regular prism or an article polygonal in its transverse section but varying in form in longitudinal section.

In some respects the lathe may be supposed to be analogous to that described in the United States Patent No. 10,783, granted April 1S, 1854. While with mylathe regular prisms with plane faces may be turned, the said patented lathe makes all its articles with curved and not p plane faces, and consequently it is incapable of producing regular prisms havingplanet'aces or sides.

In the drawings, A denotes a large circular disk or wheel applied to one end of a drivingshaft, D, having its journals a c suitably supported in boxes b b, upheld by a frame, O.

A short tube or cylindrical case, D, projects trom the outer face of the disk or plate A, and is arranged concentrically with such plate. Within this case is a bevel-gear, E, fixed to a key-shaft, F, which projects from the head o of the case.

Extending radially through the rim of the case, and having bearings therein, is a series of rotary m andrels, G G G, each ot' which carries a bevel-pinion, H, which engages with the gear E. Besides these mandrels there are two or any other suitable number ot' spur-heads, I I, projecting from the outer surface of the rim of the case.

Each mandrel, as well as each ot' the spurheads, is provided with an adjustable center, K, whose puppet-head or carrier L slides radially on the face of the disk A and between parallel guides d d, projecting from such face and arranged thereon, as represented, the several carriers being provided with means of adjusting and fixing them at different distances from their respective mandrels or spur-heads.

A circular gage-plate, M, fastened on the keyshaft, and having on its surface suitable devices or scales, operates with an adjustable indicator, N, fixed on the case D by a clampscrew, c. There is a curved slot, f, made through y the plate M, and to receive a clamp-screw, g, which goes through the slot and is screwed into the head or cap-plate C, of the case D. By turning the gage M more or less we can effect the rotation ot' all the mandrels to the degree required.

When a stiel; or piece of wood is inserted between and heldin place by each mandrel and its centre, and a pattern is placed betweenand held by each stationary spur-head and its center, the machine willbe ready for use; and while the disk D is putl in rapid revolution a workman, by the means of a chisel or turning-tool, duly supported on a rest, can turn down each pieee ot' wood to the form or gage ofthe pattern, after which he should move the gage-plate M, so as to set the pieces of wood in a proper manner to enable him to turn from them the nec essary amount to produce another face on each of them. In this way he is t0 continue until each piece may be reduced to a regular prism or is polygonal in any transverse section taken through it.

I do not claim the lathe as representedin the United States Patent No. 10,7 83.

I claim as of my invention- 1. My improved prism-lathe, made substantially as hereinbefore described-viz., with its mandrels and spur-heads G I, and their eenters K, and the poppet-heads I thereof', arranged on the i'ace ofthe head or wheel A, and in other respects in manner and so as to operatc as set forth.

2. The combination ofthe gage-plate M, and its clamp-screw g, and indicator N, with the ease D, the key-shaft F, the mandrels G, and their operating gears E, H, as described, the whole being arranged with respect to a rotary plate or wheel, I), and to operate substantially in manner and for the purpose as specified.

ALBERT KELSEY.

Witnesses: v

It. H. EDDY, F. P. HALE, J r. 

